One of my aluminum pistons popped out completely after I had the genius idea to attach a pressurized air to the caliper to push them out just a bit so I can inspect them.

I tried to stretch the boot around the piston but gave up. Seems like I need to remove the dust boot before I can put the piston back.

Anyone know how?

 

i gave up searching for a how to online and just lubed it up and stretched it in!

 

Pretty much the only way you'll do it.